Motor-driven injection molding apparatus

Abstract

The invention provides a motor-driven injection molding apparatus in which an entire of the apparatus is simplified and made compact. In a motor-driven injection molding apparatus (1), a movable metal mold (12) clamped to a stationary metal mold (11) is mounted to a movable mold plate (13), and two ball screws (17, 18) for moving the movable mold plate (13) are passed through two points on opposing corners of the movable mold plate (13). End portions of the ball screws (17, 18) are set in a cantilever state, and are rotated via pulleys (55, 55) and a timing belt (56), thereby moving the movable mold plate (13). Further, the movable mold plate (13) is guided by a slide guide having a structure that a bearing unit (14) fixed to both sides of a lower portion thereof is fitted to linear rails (15, 16). On the other hand, in an injection side, a injection side movable plate (33) to which an injection plunger (42) is fixed by two tie bars (35, 36) and two ball screws (37, 38) on respective opposing corners, and the same slide guides as mentioned above moves. The movable mold plate (13) is moved by the opening and closing side ball screws (17, 18) so as to be mold clamped, and the injection side movable plate (33) is thereafter moved so as to inject.

Description

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AI Technical Summary

Benefits of technology

The present invention relates to a motor-driven injection molding apparatus with improved structural simplicity and efficiency. By eliminating traditional tie bars and replacing them with a simpler design, fewer parts are needed, saving time and money during assembly. Additionally, the absence of certain components reduces the size requirements of the machine, allowing for increased flexibility in placement options. Furthermore, the detection of mold clamping strokes based on changes in electrical loads allows for accurate control without requiring expensive sensors. Finally, the inclusion of a plunger-in screw and a receiving hole results in faster and more efficient molding processes compared to standard screw designs.

Problems solved by technology

This patent describes an injection molding machine that has three main parts: a metal mold opening and closing mechanism for holding the molds in place, an injection mechanism for heating up and plasticizing the materials used for molding, and a driving system for moving all components. There are two types of metal mold openings and closing mechanisms - one uses a toggle action while another uses a direct hydraulic method.

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